From Clockwork Orange, a slang word for milk, laced with quasilegal DESIGNER DRUGS. By serving milk (instead of alcohol), the bar is able to serve minors. In the film, the bar has furniture in the shape of naked women and the milk is served from their nipples. The fictional ingredients include vellocet, synthemesc (synthetic mescaline), drencrom (adrenochrome). The slang terminology, called nadsat in the book, is derived from Russian

"The Korova milkbar sold milk-plus, milk plus vellocet or synthemesc or drencrom, which is the Moloko we were drinking. This would sharpen you up and make you ready for a bit of the old ultra-violence.

The Urban Dictionary Mug

A fictional drink consisting of milk and a psychoactive drug. From the book and movie "A Clockwork Orange".
Three drinks were available:
Moloko plus Vellocet
Moloko plus Synthemesc
Moloko plus Drencrom

The milkbar sold moloko plus vellocet or synthemesc or drencrom... This would sharpen you up and make you ready for a bit of the old ultra-violence.